Skin is complicated. It's our body's largest organ, one that ostensibly senses touch — but also temperature, pain, wetness, itching, and more. A new, stretchy artificial skin, seen above, can pick up many of the sensations from the real thing, and it could someday cover a life-like prosthetic hand.

A new mind-controlled prosthetic hand from researchers at Case Western Reserve University is so advanced that amputees can feel detailed textures and handle delicate objects. And yes, it sort of looks like Luke Skywalker's hand.